Conduit connection for enameled tanks



Nov. 21, 1944. s. T.BoDNAR ET AL CONDUIT CONNECTION FOR ENAMELED TANKS.

Filed Feb. 14, 1942 3 Sheets-Sheet 1 i; j. ffm. (w

Nov. 2l, 1944. BODNAR ETAL 2,362,983

CONDUIT CONNECTION FOR ENAMELED TANKS Fild Feb. 14, 1942 s sheets-sheet 2 Patented Nov. 21, 1944 y meer' AVAILABLE COPY s n j 2,352,933 l y I LooNDUmfooNNECTIoNFoR nNAM121.1111)-.r f y.TANKS .f

fPnrcelain- Steels, .'Ine;

porationfqf Chio. f

,l Cleveland, Ohio, :a 'cor-w f 'Aplilfcanon .rebruary 14, A1942; serial No; 430,850

This 'nventionnjrelates"tojthe lartl of making i" 'connection' between a (conduit, tpip'e,y or the' `like "Inthe various-arts, when 7a :conduit is threadedly connected' to the Wall ofa vessel, thethick- 7, .5

rfoi suitable 4thic'krriessi's provided either integral with and zja 'part for theivessel Wall or =attached to it; fandhavngj threadstoreceive thecondu'it.

lofemms. (olf-sessxmnf f c t tonie tankwaumsneh manner that-the enamely ing. of y`the.-.tankf;and lthesurfa'ces of .fthe ,Spud

lare'accoif'd-ingly f painted l or otherwise 'coated -with Aa jnon-corrosiveI =coat-,"the' coat being continuous A "the Wall- `ofi-the;I vesseifoutwardly; over the 1I and #outxt'othe "conduit-reoeiving -spud threads 'themselvesivv'll 'ibe so' tightly srealledras' 'to vprevent corrosivefiiquidfrom entering them??v 1t 4'follows ythat'such coats Cfa'il 'oftheir mainfpurpose foil-preventing access {o'f Athe corrosive liquid tobare' either on the threads themselv'elseor'ion-tlilefspud` surfaces-adjacent thelthre'a'dswI ".-Ifhewpresent invention haslheen made to lsolve :enameledhot Watertanksiused tp supplyihtwater to adomesticfor'l'ike'waterfsystem; 1-

It' is desirable, finename`1ed=tank fabrication .-.itofla'ttach :'separately'formed fs'puds itofith ftank may. loe'y performedvlafter 'the Spud 'is attached;

and the outside diameter .of the yspud and its 'zone of connection with the 'tank wall `must he 'rela'- tive'lyflargel-.because when'a conduit 4has been'c'on- .nected toit, thelconduit :'is'in the nature of.' a

lever andeven .a slight side .thrust thereon 'which `may,.,inadveitently.. be" .given .toit bye the plumber installing it, Willjbecause o'f the'leverage, bendthe 'Wall to which. .the .spudiis .attached and crackz'the Venamel coat,..loutat .the .same time, the 'mass of metal inthe spud at suchlargeoutside diameter must. not interfere. with' the..welciing .of ,it ito the re'lativelythin WalLof .the tank.;` and at the juncture. of the :spud .with the tank Wall, allfsurfaces that {are .to be .enameledmust either `be` planar or must be Curved on sumciennyggreat radiijasfto `-cause the enamel .toform continuouslyand solid- 131 and..such.surfaces shouldlpreierably 'be inherent in the structure' so as notltorequirereaming .or .grindingyor .rounding .metallWorkingr Opel- 1 ations.A .Y

The inventionr comprises Yin genera1,'besids the Spud:.properionthickened portion. of .the ,vessel Wall having .threads @into which v the threaded: con--v duit .is screwed, .la non-corrosive 'insert .formed of suchimaterial. as Lto render fit vsusceptible ofl -being molded into intimateisealing engagement withgthe non-.corrosive coat .of .the vessely .or Spud "toseal off the non-corrosive coaton an unbrkenarea .of the .-coatzand.y inwardly of the spudthreads;'gand which is also susceptibielo'flhaving supplemental threads formedthereon-after itis assembledwith the threaded spud which supplemental threads arezfin continuation-with thespud .threadsand tageou'siyibeadone'ibyxelectric resistance :or-:elec- ..tric arias-h@ Welding, :but the attachment f fofzspuds to tanksmf the;ename1- eoated ziclass; infafleak- @proof andzffpressureeproofu .mannen i introduces problemsfthesolutiomof which iszn'otiobviousiand many-fattempts -havexbeen:'madeitoprovide a :satiis'factory Spud .aand meanssofzattachingzfit htoii'fhe vided ato ,msurertrrat :'theienamelicoat; particularly zorrfithe inside-nf .lthe Ystank, fwillf :formfrsolidly and :completely Lpverithefspud surfaces and tank wall .fsurfacesc adjacent thereto; :andfznt: leave-bare.

' metal expos'edvtofthe' oorrosi-vc--;action` of the fhot water-'or other icontents of theatank; and the ..ithneads of th'ezspudimust beleft free :fromenamel '-slipvsoxthatused xiern'amei Willnnotv nform thereon; f .ianddmthis-.monnection the fspudmust .lbesattazched l into-whichalso theconduit is screwed and which seal 01T` the conduitFthreadsinwardlyfof the spud threads. 4` Thus no...corrodib1e" ,part of ythe Vessel is exposedl to .corrosive,..contentslofthe vessel except vthe-inner` ,endothe conduit .itself 4and if desired it also can he made of corrosion-proof It is amongl'the objectsh.theinventionz To vprovide generallyanimproved conduit .connection for tanks, and other vessels.;

To lprovide generally an. improved -connection rfor ,-joining -a :conduit `to a coated. vessel in Acommunication with its interior;

Toprovideaspud .connectionfor vessels of the type comprising 'a threaded- .conduit receiving 'spudweided-.to the vvessel wallgandin which :both the "spudqandj thev vessel wall may becoated .com-

a .pletelmand solidlyaivith(enamel;-Y

To provide a conduit spud connectorioflrelatively large diameter which may be welded to a vessel wall on a small welding area in an improved manner;

To provide in a conduit connection for enameled vessels an improved construction whereby at the juncture of the spud and vessel wall, surfaces of large radius may be provided in an improved manner to insure the formation thereon of a solid coat of enamel;

To provide a conduit connection for vessels having corrosion-proof coated walls, comprising an insert element for effecting in an improved manner the sealing-off of the inner coat of the vessel and the sealing off ofthe conduit threads;

To provide an improved method for making a Welded juncture between a spud and a tank wall to facilitate the coating of the spud and the tank wall;

To provide a threaded conduit connection for vesselsy having corrosion-proof coated walls and comprising ay conduit receiving threaded steel spud and an insert element molded into the connection for sealing off the inner coat of the vessel and the conduit threads and which may be threaded in continuation with the threads of the spud after it is interlockingly moldedvinto the connection to prevent its displacement, and to prevent it from turning in the connection while being threaded, or whilev a conduit is being screwed into or out of it;

To provide an improved method for making a spud or like conduit connection for an enamelcoated tank or other vessel.

Other objects will be apparent to those skilled in the art to whichour invention appertains.

, Our invention vis fully disclosed in the following description taken in connection with the accompanying drawings in which,

Fig. 1 illustrates an embodiment of our invention in completed `form and with a conduit con` nected therewith;

. Figs. 2 to 8 inclusive are views illustrating steps of the process of making the embodiment of Fig. 1;

Fig. 9 is a view illustrating in completed form` another embodiment of our invention;

Figs. 10 and 11 are views illustrating steps of the process of constructing the embodiment of Fig. 9.

Fig. 12 is a view similar to Fig. 1 illustrating avmodication;

Fig. 13 is a view of the parts of Fig. 12 in the process of making them;

Fig. 14 is a bottom plan View of the parts of Fig. 13;

Fig. 15 is a view of an embodiment of the invention in general similar to the embodiment of Fig. 9 but illustrating a modification;

Fig. 16 is a View illustrating one of the process steps of making the embodiment of Fig. 15;

Fig. 17 is a view taken from the plane II of Fig. 16;

Fig. 18 is a view similar to Fig. 15 illustrating a modification thereof;

Fig. 19 is a view similar to Fig. 15 illustrating another modiiication; v

Fig. 20 is a view illustrating the modification of Fig. 19 at a preceding step of the process of making it;

Fig. 21 is a view illustrating another embodimentl of the invention; f

Figs. 22 and 23are views similar respectively to views 15' and 16 illustrating a modification;

Fig. 24 is a view similar to Fig. 2 1 illustrating a modification.

While the present invention may be applied, to advantage, to vessels of various kinds, it will be described more particularly herein as applied to enamel coated tanks, to which separately formed spuds are attached; inasmuch as this is one of its more important uses. The invention has been illustrated with tank walls coated both inside and outside with enamel ibut as will become apparent hereinafter the outside enamel coat may be omit- Vted if desired. The inside enamel coat of the tank is provided primarily for the purpose of preventing corrosion of the tank wall by the contends of the tank. Typical of such tanks are the hot water tanks used as reservoirs for hot water ventional form of tank comprising a cylindrical tubular body, and heads at the ends of the body,

. and spuds for conduit connections to the tank are provided at various points on the body wall and on the heads. The spud connection herein described may be applied either to the body wall or to the head walls and for simplicity of illustration herein we have chosen to illustrate it in connection with the body Wall and in connection with a tank the walls of which are made of steel.

Referring to the drawings, particularly Figs. 1 to 8 inclusive, at I is represented a fragment of any one of the steel walls-of a tank. At the beginning ofthe process of making the complete Spud connection of Fig. 1, the wall I, as shown in Fig. 2 has a generally cup-form protuberance 2 pressed outwardly (or inwardly) from the wall by a press and` dies which may be of well-known construction, the bottom 3 of the cup being preferably flat or planar, whereas the wall I itself at the zone of the protuberance may be of curved form. A` perforation 4 is provided in the bottom 3 of the protuberance. A plurality of perforations 5-5 are also provided in the bottom 3 preferably in a series surrounding the perforation 4, although in some cases only one or two perforations 5 .may suice.

A metal working operation is then performed on the metal of the bottom 3 to form the metal surrounding the perforation 4 into an inwardly projecting annular ange G, shown in dotted lines Vin Fig. 2, and this may be performed by a press and dies as shown in Fig. 4. f

An upper die 1 has a pilot vportion B which, as the upper die 1 descends, enters the perforation 4 as a centering guide; and has a cylindrical portion 9 larger than the perforation 4 which bends the metal inwardly. The upper die I and the lower die I0 have annular surfaces II, I2, I3, I which, as the dies 9 and I0 approach each other, form the flange 6 while retaining otherwise the form of the protuberance, and leave a planar annular surface I5 yon the protuberance.

The annular ilange 6 is then ared outwardly as indicated in dotted line at I6 in Fig. 4 and this metal working operation may be performed by dies I'I and I8 as shown in Fig. 5. The lower die I8 has a concave-conical die portion I9 which, as the dies 'II and I8 approach each other, bends or rolls the flange 6 to flare its open end outwardly as shown at I6, and the upper die Il has a face 20 which preserves the planar face I5.

A spud element 2 I, Fig, 6, is made, preferably of steel, and, as shown it is generally in the form of a thick disc having as at 22 an annular groove in its lower face which provides an annular skirt 2313 Thespud is threadedfas'atfzll':with' prefer,-

i 'ter- Yof the allieve mentioned iannularfplanarasurthereon as shoWn1in.Eg'.-'f6 andfWelded-lthereto -ipreterably by.- electric resistance Welding., which thi'stmanner. :joine'dto corresponding":iprotuberr ances2 on thevtanln: .Atztheftiineoilenameling the wal-lsnproper `.of :the 5ta-nk,V :the snud; :structure :as thus farldescrib'ed iis also coated :with enamel,

.either inside for both inside.y andy outside; Fig;

illustrating the: enamel coat on "both: .the inside andoutsid'e'.. .Aszshown enamel Z8 on oneisidelcontinues :from

. the :tankfwall over .the :protuberar-rca-:and :tand

over the spud,1and.:as atzzttofthe threadsaMfiand enamel on the other' side vcontinues overs the protnberancez and mIer-Cthe .a-ring vflangeeo `and 'over-the surtacesofthe annularzgrooyez; inlt'he spud,and,=as1-at 3 l.; to l"the'threads 2'4; hthe enamel I preferably also-.covering the periphniesnof the PerforaticnsffasshoWnat132i2f Referring now toiFig. 8 ia metal :insert ,i3-3 i-is wmade in4 the 4-structure,#by meltihg'the fmetal and pouringit into the structure fand :allowingvitfto solidify; thereby` molding: it in thepstructure. .f 11n 'molding'this Tin-'sert imposition, 4it is .contemplated Athat' it willsubsequentlyivberthreaded, ..and....to 4avoid. having-.to drill .or vhereI a -:hole :therethrough for fthreading'purposea :a fhole 1.34y is Lmoldedznr cast -in' the metal'fbyurmeans of=a1plug35 having althreaded portion ffl-screwed iinto the .said

vthreads 124' and: .fa cylindrical torn-slightly tapered ,portion 'beyond-the.threads-.f Themolten-metal 'may .be poured :.into"l theicavity fof the structure =zby @turninguit'upside/:down vwith*respect to-fthe'positon of'liFg :8 land conductingvlthe molten metal :to it .through "aitube ior pipe .38',1501 the molten metal :mayzbe'z introduced through a .boren-391V in the plugthroughcwhichc'it v ows and over'. the:,enidof.^'the portion BEI-and thenceintozthecavity. .The molten-.metalillstall ;of.theintersticeszof the'lcavity'including the per- `4forations 5 .and'jis thereby. aarterit ahasfsolidified,

rigidlyfinterlocked with the structure;l

,Any-suitable metal ier @alloy-"for the insert imay be employed, .zone,.such;:alloybei-nif,r equal partstof tin :and lead.: Other alloyscmay .be; util-ized3;1;and la :metal alloywhich:expandsmpontsolidifyingmay be employed :ifldesired,.zsu ch ,alloys bein-gg:A Wellknown :in Y.theart The zalloyin'any case-ris yprei- .erably :one .which :has noV chemical reactionvwith :theenamel fcoatjzin. engagementwith it.

' The metal iplugEfis .iremovedby -unscreWi-ng it eand A'the hole :341.leftibytheeportion-l of the 4plug is :threaded-:with a `thread'.nvvlviioh isfa continuationv of fthe-thread. .2A-lof :the spud"2 I, -and'th1sis l.

preferably :performed y:by Yscrewing a-.threading tap into fand. beyondithe threads 1A: 1and cutting :threads on-'the-insert; :such :latter threads being shown'at: 40,:Eig. yl.

The spud connection is now completeyas shown '.Figafll, Land a :conduit-I suc'h as that .shownat 4|, Fig. 1 `may be screwed theretokandrwilliimake 'leale-*proofA and .pressu1:e=.proof'fjimcturewvith the insertar; or 'with ithesinsert 'and the Spud falsitse1\f,' fon the continuous--threadsthereo vThetn- 'sertf '3f3fbeirfg rigidly interlocked with the' cav-ity of4 the structure by there-entrant `configuration `thereof as shown;` there iis :noxpossibility thatfit vcan be=displaced .outwardly `axiallysf-rorntl'xeacavity;` and bein'g linterloc'zke'di with the perforations laf-'there is no possibility thatit will lrotate -Whfile being thread-ed;'wherebysitscthread 'is'.cerltain #to -be -a perfect 1an-d permanent continuationxof :the spud thread; and furthermorekthereisino possibility that it will rotate and become loose orimuztlatethe thread when the conduit'isrscrewed -into it or When, ifsuch `case should arise, itllis screwed outlofit.` y Y A The insert besides perforrning,A the functionwof making a pressure and liquid tightsealatuits threads `v'performs L another= importantvsea-ling function. 'Themetal -of the linsert b'eing n'iolded and solidified on `thefenarne'l `Iron* thesinsidelof the it Lis desirable'athatitherewbefno .enamel on fthe thread 24- ofthe snud,:and. :preferably-precautions are taken to'vavoid it.'y "In -formngxthe enamel .fcoataWet-enamel slip iis iirst appliedv and .then

:dried and then fused; and l after drying .the1'slip, if vany yot-its. happens te ibe 4on the threadiiit .is removed therefrom before firing; but '.litris impracticable to insure :that fthe :enamel :..eoat :.'Will y extendy exactly tothe thread and sto'pjthere, so that Without the insert 33, when thconcluitwlll :hasbe'en screwed in'tofthe :spud body'e -2li'there would inevitably -be bare' -metal exposed on the tackedy by ythe corrosive yiiqiilid; 'but "by employing lthe insert33 even if itherevbebare'metalfat'such point, :the liquid Y'cannot reach being-sealed loi therefrom 'bythe insertzj Themetall of the'aiinsert33 itself-is not subjecl'fto-4 corrosion by the `liquid in thetan'k if a suitable. alloy be employed therefor yand ,as would 4be the -fcase'fwithfth'ef alloys mentioned above. f

Ttifollowsthat'with the -spud structure abovej described, after lthe c onzzluit"hasbeenn jscrewed thereinto, nobare corrodibl'e -metal is-'exposed'to n the action of liquid in the tank except ythat of the conduit itself, if it'be of corrodiblema'teriaL-'and to. render the entire systemcorrosion-proof; A'the :conduit 4 I may be o f'non-corrodible Imetalsueh las is Well-known for such purposes.

It will vloev observed also thatthe outside diameter of :the spud lstructure 'as' a fWhole, vWh-ichis 4the outside diameter ,of 'the nprctu'berance2 A"(and which Vvdian:1eter'.,may be made asV large -as de- .sirejdh isla relativelylargediametenand there- '.fore mechanically rigid and strongso thatflateral thrusts im zthe conduit "4l which "Wi11-"-in evitably be .exerted .thereon 'by a plumber'insta'lling the conduit in the Spudconnectionfwill not bend. theispudeonnection at its 'juncturewiththe .tank..wa11`and .consequently willl'not crack'the enamel .coat l g s Reerring. 4to'. ,the .v modification of` '.Fies; 10, and l1 :it is believed that .a brief description will suice in view of the more complete description of the first-described form.

Here again, a protuberance 2 is formed on the wall I the bottom 3 of which is again preferably (but as in the first-described form not necessarily) planar, but having as at I5 an outwardly preferably planar annular portion. A perforation 42 is provided in the bottom 3 of the protuberance and the periphery of the perforationhas a number of notches or indentations 43-43. A spud body 44 threaded at 45, is made of steel having an annular groove 46 in one face thereof, thereby providing a skirt 41. The skirt 41 is welded to the surface I5 of the protuberance. l.'

The structure thus made is enameled as described for the rst form, and an insert 48 is molded into the structure and threaded as at 49 with threads which are a continuation of the threads 45.

The parts, the method of making and assembling them, and the functions of this form, are in general the same as those of the first described form, the principal difference being that the inwardly extending curved iiange 6 of the first described form is omitted. Here the portions of the bottom 3 of the protuberance, indicated at 50, and adjacent the periphery of the perforation 42, project inwardly beyond the skirt 41 of the spud proper 44, and overlap a part of the spud groove 46 in the nature of an annular flange which functions to interlock the insert 48 rigidly in the cavity of the structure to prevent its displacement outwardly axially therefrom; and the notches 43 interlock with the insert to .prevent its rotational displacement while being threaded or while a conduit is being screwed into or out of it.

The modification of Figs. 12, 13, and 14 is generally similar to the form of Fig. l with the following differences.

The flange 6 is provided with a plurality of perforations, for example four, shown at 5I5I which, when the skirt 23 of the spud 2| is Welded upon the protuberance 2, will lie inwardly of the rskirt and communicate with the annular groove 22; and these perforations are to facilitate forming the coat of enamel 30 on the wall of the cavity within the construction. The wet enamel slip when applied on the surfaces to be enameled tends to accumulate in the groove 22 and it is desirable that the coat of slip will be substantially of uniform thickness throughout. By providing the perforations 5I, excess wet enamel slip may drain outwardly therethrough from the groove 22.

This modification also provides a different means for interlocking the insert against rotation. In this case the perforations 5-5 ofthe flange 6 (of Figs. 3, 4, and 5), may be omitted. After the flange is given its curved flaring form by the dies of Fig. 5i, and as indicated at 52, Fig. 13, the lower edge of the flange B is bent inwardly at one or more points of its periphery, as shown at 53, particularly in Fig. 14. The flaring flange E therefore, in its final form, is partly circular and part non-circular, whereby when' the insert 33' is molded into position, it is prevented from or interlocked against rotation for the purposes described hereinbefore.

In some cases it may be desirable to .provide a Spud connection, having the properties and the advantages described hereinbefore, directly upon a wall of the tank and without first providing the protuberance 2, and such constructions are shown in Figs. 16 through 20. It is believed that a brief description of these forms will suiiice in View of the more complete descriptions of the preceding forms.

In Fig. 15 is shown one form of such spud connection, Figs. 16 and 1'7 illustrating it at a preliminary step of construction.

An opening 54 is provided in the tank wall; and the periphery of this opening may have notches cut or punched therein as illustrated for example in Fig. 11 of a preceding form, to interlockingly prevent rotation of the insert, but, as illustrating a further modification, the periphery of the opening 54 is smooth but the opening itself is oval or non-circular as shown in Fig. 17. A plurality of perforations 55 are .provided outwardly of the perforation 54.

The steel spud body 56, threaded for a conduit as at 51, has thereon a skirt 58 which is welded directly to the wall I of the tank and surrounding the series of perforations 55-55.

A vitreous enamel coat is then applied as shown in Fig. 15, the coat being indicated at 59 on the inner wall of the tank and over the inner Wall of the cavity'BIl in the spud, and over the portions ofthe tank wall I which surround the opening 54, and over the walls of the perforations 55; andthe perforations 55 function to drain the slip as described in connection with the form of Figs.

l2 to 14.

A plug not shown is then screwed intothe steel spud and the insert 33 is molded into the construction and threaded. (See description of Fig. 8.) In this form the molten insert 33 lls the cavity of the construction to approximately the level of the inner wall of the tank as indicated at 6I, and interlocks 'with the non-circular periphery of the opening 54 to prevent its rotation, and interlocks with the portions of the wall l inwardly of the skirt 58 to prevent longitudinal displacement of the insert. Longitudinal thickness of the insert maybe made as great as desired by the length axially of the spud skirt 58.

The form of Fig. 18 is similar to the form of Fig. 15 except that here greater longitudinal thickness of the insert is provided by means of an annular dam or mold 62 placed as a molding device temporarily in contact with the inner enameled surface of the-body I, so that when the molten insert is poured into the construction, it rises within the dam 62 to a level for example such as that shown at 63. After the insertl has solidified, the dam 62 is removed.

The form of Figs. 19 and 20 is also similar to that of Fig.- 15 but the longitudinal extent of the insert is increased by a sheet metal molding device shown generallyat 64. Fig. 20 illustrates the construction after it has been enameled, and with the sheet metal device 64 in place ready for the insert to be molded in position.

The sheet metal device 64 is generally in the form of an annular channel, with the concave side of the channel toward the opening 54. The outer wall 65 of the channel is continuous annularly and terminates in an annular edge BE. The inner wall 61 of the channel has therein a number of relatively large perforations 68. At its upper edge, the inner wall B1 of the channel has an outwardly extending flange 69 thereon. The flange 68 and adjacent parts of the inner wall 61 are discontinuous annularly, the discontinuity being preferably effected by a number of slots 10-10 which render the upper annular extremity of the inner wall 61 resilient, or at vleast flexible.

, i maestosa I 'Thedevicey 64. is putinto they position oflFig.

by lbending theupper end. of the ,inner vwall 61 of the channel inwardlyso that it will pass through, .the 'opening 54, and thenl bending it outwardly -so;.that the :flange 69 'will lie upon and overlap the enamel coat' ,adjacent the periphery in.l place after solidication-,of theinsert. .Y

`the formof Fig. 21, the spud body I2vr is not provided with the groove and skirt of the spuds of the other, forms. Thebody wall l is provided with a protuberance ,13=.`extending, away- -from the` spud;v and ythe spud bodyY and protuberance are of. such ldiameter that thespud body over-l laps the tank body I von-m'utually engaged annular portions at14 Whereat they are welded together. The. opening' 54 is provided in the bottom 'l5 of the protuberance; and in orderv to facilitate forming the parts, the opening may be provided after the protuberance is press-formed in the wall. The bottom 15 of the protuberance may be spaced asfar from the spud body as dev sired whereby the axial extent of the insert 33 may be made as great as wanted. The cavity pingrelation; to aLportion ofthe vspud body,a corrosion-proof coaton .the inner wall surface of the vessel, an insertfmoldedy tol interlock with the projection and to seal the .enamel coat with respect tothe `spud thread, and an opening 4in the insert having a taperedconduit Athread constituteY ing aV continuation of the taperedspud thread.A

.. 2. In a conduit connection for ,a vessel wall having anopening therein, a spud .body provided with a taperedconduit threadv and welded to the wall of thevessel on avportion thereof surrounding the opening, a projection integral with the .wal-l andspudbody. projecting inwardly toward the axis of the' opening and-in spaced overlap ping relation vtot ai-portion ofv the spud body, a corrosion-proof coat on theinner wall surface of the;vessel continuing over' the -projection and over a portion of the spud body surroundingits thread, an insert molded toi-n-terlock with `the projection and to seal-the enamel coat with re,

specty tothe spud thread, andan Aopening .inthe insert having tapered conduit thread constitutingia continuation of the tapered spudthread.

a conduit-'connection Afor a vessel wall having any opening. therein, v,a spud body provided with artaperedconduit thread-and welded to the `wall of the vessel on a portion thereof surrounding the opening, a ange integral with the wall ,and spud body projecting inwardly toward and circumscribing the axis of the opening and in spaced overlapping relation to a portion of the between the protuberance bottom and the spud body, holds the insert against vlongitudinal displacement and the interlock of the insert with the non-circular periphery of the opening 54 locks it against rotation.

In the modification of Figs. 22 and 23 (which y is generally similar to that of Figs. 16 and 15)A the wall of the body I, in the portions 16 thereof adjacent to the perforation 54, are bent toward the spud body 56; and the insertr 33 therefore interlocks more rigidly with the structure tha f in the form of Figs. 22 and 23.

In Fig. 24, a similar bend in the portions 121 makes a like improvement over the form of Fig.`

2l to which it is otherwise similar.

It will of course be understood (as referredto in connection with Fig. 8) that at the time of pouring in the molten insert, the parts of all of' the forms and modifications above described may rbe disposed upside down in respect to theposie 1. In a conduit connection for a vessel wall having an opening therein, a spud body provided with a tapered conduit thread and welded to the wall of the vessel on a portion thereof surround-v ingfthe opening, a projection integral with the f wall and spud body projecting inwardly toward the axis of the openingand in spaced overlapspud body, a corrosion-.proof coat on the inner ywall surface of the vessel, an insert molded to interlock with the ange to prevent bodily displacement of the insert and' sealing the enamel coat withrespect to the spud thread, and the flange provided with means interlocking with the insert to prevent rotational displacement thereof,V and an opening in the insert having a tapered conduit thread constituting a continuation of the tapered spud thread.

4. In a conduit connection for a vessel wall having a perforation in the wall, a taper threaded spud bodyhaving a skirt portion welded to the vessel wall on portions thereof surrounding and.

spaced outwardly from the periphery of the opening, the wall on portions thereof more adjacent the opening projecting toward the axis of the spud thread in the form of a flange the flange being spaced axially from the spud body, an insert molded to interlock` with the ange and having an opening therein provided with a taper thread constituting a continuation of the tapered spud thread.

5. In a conduit connection for a Vessel Wall having a perforation in the Wall, a taper threaded spud body having a tubular skirt welded to the vessel Wall on annular portions thereof surrounding and spaced outwardly radially from the periphery of the opening, the wall on portions thereof more adjacent the opening projecting toward the axis of the spud thread in the form of a flange the flange being axially lspaced from the spud body, an insert molded to interlock with the flange and the flange being formed to prevent axial and rotational displacement of the insert, and the insert having an opening therethrough provided with a taper thread constituting a, continuation of the tapered spud thread.

6. In .a conduitconnection for a vessel having a perforation in the wall, a taper threaded spud body welded to the vessel wall on annular portions thereof surrounding and spaced outwardly radially from the periphery of the opening, the

lock `with the flange and having an opening therein provided with a tapered thread constituting a continuation of the tapered spud thread.

7. A conduit connection for a vessel Wall, comprising a generally tubular protuberance on the wall of the vessel surrounding an opening in the wall; a taper screw threaded spud body on the tubular protuberance; a projection extending inwardly from the wall of the tubular protuberance; and an insert moldedin the tubular protuberance and interlocked with the projection and having a tapered thread constituting a, continuation of the tapered spud thread.

8. A conduit connection for a vessel wall comprising a tubular protuberance on the wall surrounding an opening in the wall; a taper screw threaded spud welded to an annular portion of the protuberance intermediate its end portion and the tank Wall; the end portion of the tubular protuberance projecting generally toward its axis in the form a ange; an insert molded in the protuberance and over the flange, and having a tapered thread constituting a continuation of the tapered spud thread.

9. A conduit connection for a vessel wall comprising a tubular protuberance on the wall surrounding an opening therein; the end portion of the protuberance projecting generally toward its axis in the form of a flange; a, taper threaded spud body spaced from the flange and Welded to the vessel wall; an insert molded in the protuberance and between the flange and spud body;

and a. tapered thread constituting the insert in A continuaation of the tapered spud thread.

10. A conduit connection for a vessel wall, comprising a generally tubular protuberance on the Wall of the vessel surrounding an opening in the wall; a taper screw threaded spud body on the tubular protuberance; the tubular protuberance comprising a, portion extending inwardly toward the axis of the screw thread; and an insert molded in the tubular protuberance and interlocked with the inwardly projecting portion and having a tapered thread constituting a continuation of the tapered spud thread.

STEPHEN T. BODNAR. WALTER S. GAINES.

CERTIFICATE OF CORRECTION.

Novemb er 21 1911,14..

Patent No. 2,562,985. Y STEPHEN T. BODNAR, ET AL.

I 'It isxvhereby certified.- that error appears in the printed specification" ,of the `abf/ofve numbered patent requiring correction as follows: Page 6, secgsd-.edimm lines 12 and 15, @1am 9,

for the words "Consttlitng'the inin continuaation"' read --in the insert constituting a continuation;

and that the said Letters Patent shouldbe read with this correction therein that the same may conform to the record of the case in the Patent Office.

signed and sealed this 20th day of February, A. D. 19m.

Leslie Frazer v (Seal) Acting Commissioner of Patents. 

